(a)[2]
State what the term work function energy of a metal means.
(b(i))[2]
Determine how many photons arrive at the surface each second.
(b(ii))[2]
Calculate the work function energy $\phi$ for the metal.
(c(i))[2]
State and explain how this change affects the maximum kinetic energy of the photoelectrons.
(c(ii))[2]
State and explain how this change affects the photoelectron emission rate.